[5] Will Haskell ran for and won the 26th district in 2018 as a first-time candidate, beating incumbent Republican Toni Boucher who had held the state senate seat since 2009.

[8] His campaign received endorsements from Congressman Jim Himes, Senator Chris Murphy of Connecticut, and former president Barack Obama.

[14] He has voted in favor of Paid Family and Medical Leave, a $15 minimum wage, a ban on ghost guns, cannabis legalization and police accountability reforms.

Haskell has earned a 100% approval score from the Connecticut League of Conservation Voters, an "F" grade from the NRA Political Victory Fund,[16] and a 100% attendance record for votes on the Senate floor.

[20] On January 3, 2022, Haskell announced that he would not seek reelection that year and would retire at the end of his term, citing his desire to attend law school and live closer to his then-fiancée, Katie Cion, in New York City.